Cooking oven



FIG. 1 is a perspective view of a cooking oven according to the design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof with the opposite side view being identical;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a front view thereof in an open arrangement. 

CLAIM The ornamental design for a cooking oven, as shown and described. 